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Different strains react differently to light. They call it photo-sensitivity. This is an important issue to be aware of if you ever plan on revegging your plant. I think the general consensus would agree that it doesn't do anything to help the plants and should be avoided. However, like i said about the strain your growing will make a big difference. Most kinds of stresses on the plants should be avoided (although some are beneficial). I prefer a consistent cycle that closely emulates the outdoor light cycle (with the exception of the change from 18/6 to 12/12 being overnight). Having a sporadic or light cycle that isn't on a time during vegging could increase your likeliness of having a male plant or an intersexed female (hermi). hope that helps.